The typeof description is contrary to the specification.

[demimurych]

advanced-js-objects/chapters/chapter-1.md

Line 195 in ffb9953

Using the operator on a value produces a string that gives an indication of the type. Here are the possible values it can return:

Using the operator on a value produces a string that gives an indication of the type.

The typeof operator does not specify a type.
The unary typeof operator returns a string that is set according to various conditions.
https://tc39.es/ecma262/#sec-typeof-operator

Table - "Table 41: Operator Result Type" does not give all variants of conditions.

A typical example is an object with an internal value of [[IsHTMLDDA]]. As a result of performing a type operation on such an object, the result will always be undefined.

For this reason, it is incorrect to say that - typeof gives an indication of the type. This is misleading.

[carltheperson]

I intentionally used the vague term "indication". Meaning I'm not saying there is a on-to-one mapping between language type of result of typeof.

I agree it doesn't give the language type in every case meaning you can't rely fully on it for that. Still, I think it's fair to loosely describe its purpose as indicating the type of a value (and then explain when that isn't the case).